Valparaiso and Panama there are twenty-one different ports at which these steamers stop, in performing their monthly trips to and fro, for freight and passengers, leaving Panama on the 27th and Valparaiso on the 30th of each month. The voyage is punctually performed in twenty-four days. The feasibility of establishing an American line of steamers upon that coast is strongly urged. The wealth of the silver mines of Copiapo is so great that every English steamer at Panama transmits hundreds of thousands of dollars' worth to England in solid bars. * * * * * From CALIFORNIA we have intelligence to the 15th of September. The disturbances at Sacramento City, growing out of resistance to the land claims, have entirely subsided, the squatters having been dispersed. Three or four persons were killed upon each side in the riots of which we have already given an account. A gentleman had arrived in California deputed by Mr. LETCHER, U.S. Minister in Mexico, to attend to the settlement of land titles. He had expressed the belief that most of the grants made by the Governors before the acquisition of California by the United States will be confirmed by our Government, on the evidence Mr. Letcher is prepared to furnish from the official records in the city of Mexico, as to the invariable practice of the Mexican Government in this particular. His assurances upon the subject had given general satisfaction.----Early in September there was a complete panic in the money market at San Francisco, and several of the most prominent houses had failed. Confidence, however, had been fully restored at the date of our latest advices. The losses by the three great fires which had visited the city were supposed to have occasioned the monetary difficulties.----Fears were entertained that the overland emigrants would suffer greatly during the present season. It was believed that ten thousand were on the way who had not crossed the Great Desert, one half of whom would be destitute of subsistence and teams on reaching Carson River. They had been deceived into taking a longer and more difficult route, and had lost most of their animals, and not unfrequently men, women, and children had sunk under the hardships of the road, and perished of hunger or thirst.----Indian difficulties still continued in different parts of California, the troops and citizens were making some progress in breaking up the bands which caused them the most difficulty.----The accounts from the mines continue to be highly encouraging. It is unnecessary to give in detail the reports from the various localities; they were all yielding abundant returns. It was believed that much larger quantities of gold will be taken from the mines this season than ever before.----From the 1st of August to Sept. 13th, there arrived at San Francisco by sea 5940 persons, and 4672 had left.----The tax upon foreign miners does not succeed as a revenue